Hi, what is the PH for NH3 in gas form? When I tested it with PH paper it showed a number around 8-9.5, but from searching online its a higher number. I'm not sure which one is correct. Thanks

Answer 1

Ammonia in the gas form has no pH. Only when it is dissoved in water (or water vapor), does it exhibit pH. If you tested it with dry pH paper, in the pure gas form (no water vapor), you would have gotten no reaction.

Answer 2

Hi, I tested it with moist PH paper, i think its from the water vapour, what PH was i suppose to get?

Answer 3

How much water? How much gas? Do you have any way of knowing the concentration of the NH3(aq) that was on the paper? Probably not. Whatever pH you obtained is the pH you should get if the paper was the right kind of pH paper.